Try to make some things work on my local system with Ruby newer than 2.6

Yes, the Gem::Version look a little odd, but it's a simple way that's available
in the Gemfile to do version comparison from what I can tell.

Author: ashak

Gemfile

@@ -11,5 +11,6 @@ group :development do
   gem 'pry'
   gem 'pry-byebug'
   gem 'rake', '10.1.0'
+  gem 'sync' if Gem::Version.new(RUBY_VERSION) > Gem::Version.new('2.6')
   gem 'syck' if RUBY_VERSION.split('.').first.to_i > 1
 end

Gemfile.lock

@@ -67,6 +67,7 @@ GEM
     ruby-progressbar (1.10.1)
     stomp (1.4.9)
     syck (1.4.0)
+    sync (0.5.0)
     systemu (2.6.5)
 
 PLATFORMS
@@ -85,6 +86,7 @@ DEPENDENCIES
   rspec (= 3.3.0)
   rubocop (= 0.32.1)
   syck
+  sync
 
 BUNDLED WITH
    1.17.3